OPEL ASTRA ENGINE PROBLEM

2012 Opel Astra • 5,400 miles

Hello,

my astra J, bought in June 2012 is sometimes making wierd noise when starting. For about 18 seconds sounds horrible, than is back to normal. Engine is struggeling to get the revs. Its 1,4 Turbo engine 140 HP, in service they put new software, but than it came back after two months. Its not happening regulary, once a week maybe. I attached video of the noise on youtube. Here is the link - http://www.youtube.com/watch?v=qQolImo-TK8